Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 22, Pages 10313-10319Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta01367e
Keywords
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Funding
- SABIC
- China Scholarship Council
- Scientific User Facilities Division of the U.S. Department of Energy
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Well crystallized and interconnected SnO2 nanoparticles (<5 nm) were synthesized via oxidation of exfoliated SnS2 sheets. The SnO 2 nanoparticles exhibit a high total faradaic efficiency (FE) of 97% towards electrochemical reduction of CO2 at -0.95 V vs. the reversible hydrogen electrode (RHE). The main product ratio of CO/HCOO- which intrinsically correlates to the surface SnOx/Sn ratio variation varies with the applied potential. Beyond CO and HCOO- products formed via the two-electron transfer pathway, hydrocarbons and oxygenates are produced. The formation of hydrocarbon (CH4) versus oxygenate (C2H5OH) depends on the choice of electrolyte (KOH vs. KHCO3), both of which can reach a maximal faradaic efficiency of 10%. The distinctive grain boundary and exposed corner/step sites in the interconnected SnO2 nanoparticles contribute to the high FE of CO2 reduction and unique selectivity.
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